JP2007120731A - Diaphragm valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm valve which does not cause the liquid storage and stagnation in an uprightly arranged piping position and also can remarkably reduce its cost. <P>SOLUTION: The diaphragm valve 1 comprises a valve seat 3, a first passage 4 and a second passage 5 to be connected via the valve seat, and a diaphragm 6 which can disconnect the first passage and the second passage. In this case, the second passage is arranged so as to look downward making a specified angle with respect to the first passage in the uprightly arranged piping position where the first passage is arranged so as to be horizontal and the valve seat comes to the lowest position of the first passage in the circumferential direction, and the lowest surface of the valve seat in the circumferential direction is positioned so as to be lower than the lowest surface of the first passage in the circumferential direction and so as to be higher than the lowest surface of the second passage in the circumferential direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a diaphragm valve that opens and closes a passage by a diaphragm.

In the conventional diaphragm valve, as shown in FIG. 5, a piston 102 that reciprocates in the cylinder 101 by receiving fluid pressure such as air, spring force or the like is attached to the spindle 103 and the spindle 103. A diaphragm 105 made of an elastic material such as rubber is actuated through the compressor 104. The diaphragm 105 is brought into pressure contact with the valve seat 109 of the weir 108 protruding from the passage 107 in the valve body 106, and the diaphragm 107 is closed by closing the passage 107 (for example, Patent Documents). 1).
JP 2004-144225 A (FIGS. 1 and 3)

  As described above, in the conventional diaphragm valve, the diaphragm 105 is closed by pressing the valve seat 109 of the weir 108 protruding in the passage 107 of the valve body 106 and closing the passage 107. To do. However, in this conventional diaphragm valve, since the valve seat 109 is provided in the weir 108 protruding in the passage 107 of the valve body 106, the valve seat 109 is at the lowest position in the circumferential direction of the passage 107. In the upright piping position arranged so that the rise, the rising part of the weir part 108 becomes an obstacle, and the liquid and powder remaining in the passage 107 at the time of discharging are not smoothly discharged. In the case of liquid, there is a problem that the liquid pool is generated, and in the case of powder, there is a retention.

  To solve this problem, the valve seat is formed so as to be substantially flush with the lowest circumferential surface of the passage, and a special diaphragm having a convex shape larger than the standard in order to correspond to this flush seat. It has also been performed to prevent liquid accumulation and retention. However, the production of a special diaphragm having a convex shape larger than this standard has caused a problem that the cost is increased.

  The present invention has been made to solve such a problem, and there is no occurrence of liquid accumulation or stagnation at the upright piping position, and a standard-shaped diaphragm can be used at the same time, thereby greatly reducing the cost. It is an object of the present invention to provide a diaphragm valve that can be used.

  In order to solve the above-mentioned problem, the means employed by the present invention includes a valve seat, a first passage and a second passage connected to each other via the valve seat, a first passage in pressure contact with the valve seat, In a diaphragm valve including a diaphragm capable of blocking the second passage, the second passage is disposed so that the first passage is horizontal and the valve seat is at the lowest circumferential position of the first passage. In the upright piping position, a predetermined angle with respect to the first passage is provided to face downward, the lowest circumferential surface of the valve seat is lower than the lowest circumferential surface of the first passage, and the second passage It exists in being located higher than the circumferential direction lowest surface. Here, the circumferential direction means a direction perpendicular to each streamline.

  Thus, in the diaphragm valve of the present invention, the lowest circumferential surface of the valve seat is positioned lower than the lowest circumferential surface of the first passage and higher than the lowest circumferential surface of the second passage. When discharging at the upright piping position, the liquid and powder in the first passage pass through the valve seat and flow into the second passage, and the liquid and powder flowing into the second passage pass through the second passage. Flows down. Therefore, no liquid pool or stagnation occurs on both sides of the valve seat at this upright piping position.

  Further, since the second passage is disposed at a predetermined angle with respect to the first passage and facing downward, the distance between the diaphragm mounting portion and the valve seat is close, and a special diaphragm having a large convex shape needs to be used. Disappears. That is, a standard-shaped diaphragm can be used, and a significant cost reduction can be achieved.

  The predetermined angle is preferably set to 90 ° or more and less than 180 °. When the predetermined angle is 90 °, the maximum discharge effect can be obtained with respect to the liquid or powder flowing into the second passage. If the predetermined angle is within the above range, the liquid or powder is smoothly discharged. be able to. The predetermined angle is more preferably set to 90 ° or more and 150 ° or less. If the predetermined angle is limited to 150 ° or less, there is an advantage that the design of the diaphragm valve becomes easier in terms of diaphragm selection and the like.

  The size of the diaphragm is preferably set such that the ratio of the minimum cross-sectional area in the vicinity of the diaphragm to the cross-sectional area of the passage is 0.7 or more and 1.0 or less. In the diaphragm valve of the present invention, since the second passage is arranged to face downward at a predetermined angle with respect to the first passage, it may be difficult to ensure the minimum cross-sectional area in the vicinity of the diaphragm. Is done.

  For this reason, by setting the size of the diaphragm so that the ratio of the minimum passage sectional area in the vicinity of the diaphragm to the passage sectional area of the passage is 0.7 or more, a smoother flow is ensured for the fluid and powder. be able to. It is more desirable that the diaphragm size is set such that the ratio of the minimum cross-sectional area in the vicinity of the diaphragm to the cross-sectional area of the passage is 0.9 or more and 1.0 or less. By doing so, the flow of fluid or powder becomes smoother.

  In the dual diaphragm valve in which two of the above diaphragm valves are connected in series, one passage of the two diaphragm valves is connected so that the valve seats are arranged upside down with respect to each other. When the upper diaphragm valve is disposed at the upright piping position with the other passage of the upper diaphragm valve horizontal, the lowermost surface of the diaphragm of the side diaphragm valve It is desirable that it is lower than the lowest circumferential surface of the other passage and higher than the lowest circumferential surface of the other passage of the lower diaphragm valve.

  In the diaphragm valve, since the second passage is arranged to face downward at a predetermined angle with respect to the first passage, there is an angle between the first passage and the second passage of the diaphragm valve, and the diaphragm When installing a valve, horizontal piping may not be possible. However, by forming a double diaphragm valve in which one of the passages is connected so that the valve seats are arranged upside down in this way, the inlet / outlet of the double diaphragm valve is 180 °. It will face in the opposite direction, which allows horizontal piping.

  In addition, when the upper diaphragm valve is disposed at an upright piping position where the other passage of the diaphragm valve is horizontal, that is, the upper diaphragm valve is horizontally placed on the other passage and the valve seat is placed on the other passage. In the upright piping position arranged so as to be at the lowest position in the circumferential direction of the passage, the lowest diaphragm surface of the lower diaphragm valve is set to be lower than the lowest circumferential face of one passage of the lower diaphragm valve. By positioning the lower diaphragm valve higher than the lowest surface in the circumferential direction of the other passage of the lower diaphragm valve, it is possible to prevent a liquid pool or stagnation from occurring in or near the diaphragm of the lower diaphragm valve. .

  The diaphragm valve of the present invention is capable of blocking the first passage and the second passage by being in pressure contact with the valve seat, the first passage and the second passage connected to each other via the valve seat, and the valve seat. In a diaphragm valve having a diaphragm, the second passage is located with respect to the first passage in an upright piping position where the first passage is disposed horizontally and the valve seat is positioned at the lowest position in the circumferential direction of the first passage. The valve seat is positioned so as to face downward, and the lowest circumferential surface of the valve seat is located lower than the lowest circumferential surface of the first passage and higher than the lowest circumferential surface of the second passage. In addition, there is no occurrence of liquid accumulation or stagnation at the upright piping position, and at the same time, a standard-shaped diaphragm can be used, so that it is possible to achieve a significant cost reduction.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out a diaphragm valve according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a front sectional view showing a diaphragm valve according to the present invention, FIG. 2 is a front sectional view showing an opening / closing mechanism of FIG. 1, and FIG. 3 is a front view showing a diaphragm valve different from FIG. FIG. 4 is a cross-sectional view, and FIG. 4 is a front cross-sectional view showing another diaphragm valve different from FIGS. 1 and 3.

  As shown in FIG. 1, the diaphragm valve 1 is formed of a valve body 2, a diaphragm 6, and an opening / closing mechanism 30 for the diaphragm 6. The valve body 2 is provided with a valve seat 3 and a first tubular passage 1 and a second passage 5 which are connected to each other via the valve seat 3.

  The second passage 5 extends in the opposite direction of the first passage 4 with the valve seat 3 interposed therebetween. As shown in the figure, when the second passage 5 is disposed so that the first passage 4 is horizontal and the valve seat 3 is positioned at the lowest position in the circumferential direction with respect to the first passage 4, An angle of 120 ° (predetermined angle) is provided with respect to the lower side. Here, the circumferential direction means a direction perpendicular to the streamline of the passage 4 and the like.

  The valve seat 3 is formed by an inclined surface that is inclined downward from the first passage 4 to the second passage 5, and the second passage 5 is formed to be inclined further downward from the inclined surface of the valve seat 3. Accordingly, the lowest circumferential surface of the valve seat 3 is positioned lower than the lowest circumferential surface of the first passage 4 and higher than the lowest circumferential surface of the second passage 5.

  The diaphragm 6 does not need to have a special shape, and a standard shape diaphragm can be used. However, the size of the diaphragm 6 is set such that the ratio of the minimum cross-sectional area in the vicinity of the diaphragm 6 to the cross-sectional area of the passages 4 and 5 is 0.7 or more and 1.0 or less. That is, the size of the diaphragm is normally set so that the ratio of the minimum cross-sectional area in the vicinity of the diaphragm to the cross-sectional area of the passage is less than 0.7. used.

  This is because in the diaphragm valve 1, the second passage 5 is disposed so as to face downward at an angle of 120 ° with respect to the first passage 4, so that a minimum cross-sectional area can be secured in the vicinity of the diaphragm 6. This is because it may be difficult. Thus, by setting the size of the diaphragm 6 so that the ratio of the minimum cross-sectional area in the vicinity of the diaphragm 6 to the cross-sectional area of the passages 4 and 5 is 0.7 or more, A smoother flow can be ensured.

  The size of the diaphragm 6 is two sizes larger than a normal one so that the ratio of the minimum passage cross section in the vicinity of the diaphragm 6 to the passage cross section of the passages 4 and 5 is 0.9 or more and 1.0 or less. It is further desirable to be set. By doing so, the flow of fluid or powder becomes smoother.

  As shown in FIG. 2, in the opening / closing mechanism 30, a piston 36 urged downward by two coil springs 35 slides in an air cylinder 37 in an airtight manner. When the working air is injected into the air chamber 38 on the lower side of the piston 36, the piston 36 rises against the spring force of the coil spring 35. A spindle 39 is attached to the piston 36, and the spindle 39 reciprocates up and down by the piston 36.

  As shown in FIG. 1, a compressor suspension 41 is attached to the tip of the spindle 39, and a compressor 42 is attached to the compressor suspension 41. The spindle 39 shown in FIG. 2 is reciprocated by the urging force of the coil spring 35 or the operating air, thereby operating the diaphragm 6 via the compressor suspension 41 and the compressor 42. When the diaphragm 6 is pressed against the valve seat 3, the diaphragm valve 1 is closed. The opening / closing mechanism 30 is air-operated. However, the opening / closing mechanism is not necessarily limited thereto, and the opening / closing mechanism may be of another type such as a manual type.

  As described above, in the diaphragm valve 1, the lowest circumferential surface of the valve seat 3 is positioned lower than the lowest circumferential surface of the first passage 4 and higher than the lowest circumferential surface of the second passage 5. Therefore, at the upright piping position where the valve seat 3 is arranged at the lowest position in the circumferential direction of the passages 4 and 5, the liquid or powder in the first passage 4 passes through the valve seat 3 during discharge. As a result, the liquid or powder that has flowed into the second passage 5 and has flowed into the second passage 5 flows downward from the second passage 5. Therefore, no liquid pool or stagnation occurs on both sides of the valve seat 3.

  In addition, since the second passage 5 is disposed at an angle of 120 ° with respect to the first passage 4 so as to face downward, the distance between the attachment portion of the diaphragm 6 and the valve seat 3 approaches, Thus, it is not necessary to use a special diaphragm having a large convex shape. That is, the diaphragm 6 having a standard shape can be used, and the cost can be greatly reduced.

  Furthermore, in the conventional diaphragm valve, in order to prevent liquid accumulation and stagnation at the upright piping position, the valve seat is arranged in the circumferential direction with respect to the passage so that the lowest circumferential surface in the vicinity of the valve seat is as much as possible. It has also been attempted to install a diaphragm valve at an angle. However, in this case, there is a problem that a large opening / closing mechanism is inclined with respect to the pipe in the circumferential direction, so that a large pipe space is required in the inclination direction. However, according to this diaphragm valve, there is no need to attach the valve seat to the passage in the circumferential direction in order to prevent liquid accumulation or retention, and therefore there is an advantage that wasteful piping space can be eliminated. .

  The diaphragm valve 51 shown in FIG. 3 has an angle (predetermined angle) formed by the first passage 53 and the second passage 54 of the valve body 52 set to 90 °. As described above, when the angle formed by the first passage 53 and the second passage 54 is 90 °, the maximum discharge effect can be obtained with respect to the liquid or powder flowing into the second passage 54.

  Therefore, the angle (predetermined angle) formed by the first passages 4 and 53 and the second passages 5 and 54 of the valve bodies 2 and 52 including the diaphragm valve 1 described above is set to 90 ° or more and less than 180 °. Would be desirable. If the predetermined angle is within this range, the liquid or powder can be discharged smoothly. The predetermined angle is more preferably set to 90 ° or more and 150 ° or less. If the predetermined angle is limited to 150 ° or less, there is an advantage that the design of the diaphragm valve becomes easier in terms of diaphragm selection and the like. In this respect, the diaphragm valve 1 described above is set to a predetermined angle of 120 °, and the ease of use is maximized in both the discharge and design of the liquid and powder.

  The diaphragm valve 61 shown in FIG. 4 is a double diaphragm valve in which two diaphragm valves 62 and 72 having the same configuration as the diaphragm valve 1 shown in FIG. 1 are connected in series. The two diaphragm valves 61 are connected such that one passages 63 and 73 of the two diaphragm valves 62 and 72 are disposed upside down with respect to the respective valve seats 64 and 74. Further, the lowest circumferential surface of the diaphragm 75 of the lower diaphragm valve 72 is located on the lower side when the upper diaphragm valve 62 is disposed at the upright piping position with the upper (other) passage 66 being horizontal. The diaphragm valve 72 is located lower than the lowest circumferential surface of the passage 73 on the upper side (one side) and higher than the circumferential lowest surface of the lower side (other side) passage 76 of the lower diaphragm valve 72.

  Thus, by forming the two diaphragm valves 61 in which the one passages 63 and 73 are connected so that the valve seats 64 and 74 are arranged upside down with respect to each other, this two diaphragms are formed. The passages 66 and 76 forming the inlet / outlet of the valve 61 go in opposite directions by 180 °, thereby enabling horizontal piping.

  Further, when the upper diaphragm valve 62 is disposed at the upright piping position with the upper (other) passage 66 being horizontal, that is, the upper diaphragm valve 62 is horizontally placed on the upper passage 66 and the At the upright piping position where the valve seat 64 is positioned at the lowest position in the circumferential direction of the upper passage 66, the lower circumferential diaphragm surface of the diaphragm 75 of the lower diaphragm valve 72 is placed on the lower diaphragm valve 72. The diaphragm 75 of the lower diaphragm valve 72 is positioned lower than the lowest circumferential surface of the upper passage 73 and higher than the lowest circumferential surface of the lower passage 76 of the lower diaphragm valve 72. It is possible to prevent liquid accumulation and stagnation from occurring in or near the inside.

  The above-described diaphragm valve is merely an example, and various modifications can be made based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

It is front sectional drawing which shows the diaphragm valve which concerns on this invention. It is front sectional drawing which shows the opening / closing mechanism of FIG. It is front sectional drawing which shows another diaphragm valve. It is front sectional drawing which shows another diaphragm valve. It is front sectional drawing which shows the conventional diaphragm valve.

Explanation of symbols

1 Diaphragm valve 2 Valve body 2
3 Valve Seat 4 First Passage 5 Second Passage 6 Diaphragm 30 Opening / Closing Mechanism 35 Coil Spring 36 Piston 37 Air Cylinder 38 Air Chamber 39 Spindle 41 Compressor Suspension 42 Compressor 51 Diaphragm Valve 52 Valve Body 53 First Passage 54 Second Passage 61 Diaphragm Valve 62 Diaphragm valve 63 Second passage 64 Valve seat 66 First passage 72 Diaphragm valve 73 Second passage 74 Valve seat 75 Diaphragm 76 First passage 101 Cylinder 102 Piston 103 Spindle 104 Compressor 105 Diaphragm 106 Valve body 107 Passage 108 Weir portion 109 Valve seat

Claims (4)

  The valve seat (3), the first passage (4, 53) and the second passage (5, 54) connected to each other via the valve seat, the first passage and the first passage in pressure contact with the valve seat In a diaphragm valve (1, 51) provided with a diaphragm (6) capable of blocking the second passage, the second passage is configured such that the first passage is horizontal and the valve seat is disposed on the first passage. The erect piping position arranged so as to be at the lowest position in the circumferential direction is arranged so as to face downward with a predetermined angle with respect to the first passage, and the lowest circumferential surface of the valve seat is A diaphragm valve characterized by being positioned lower than the lowest circumferential surface of one passage and higher than the lowest circumferential surface of the second passage.   The diaphragm valve according to claim 1, wherein the predetermined angle is set to 90 ° or more and less than 180 °.   The size of the diaphragm (6) is set so that the ratio of the minimum cross-sectional area in the vicinity of the diaphragm to the cross-sectional area of the passage (4, 5, 53, 54) is 0.7 to 1.0. The diaphragm valve according to claim 1 or 2, wherein: A two-diaphragm valve (61) in which two of the diaphragm valves (62, 72) according to any one of claims 1 to 3 are connected in series, wherein one of the passages (63) of the two diaphragm valves (63) 73) are connected such that the valve seats (64, 74) are arranged upside down with respect to each other, and the lowest circumferential surface of the diaphragm (75) of the lower diaphragm valve (72) is: When the upper diaphragm valve (62) is disposed at the upright piping position with the other passage (66) of the upper diaphragm valve horizontal, the one passage (73 of the lower diaphragm valve) The diaphragm valve is lower than the lowest circumferential surface of the lower diaphragm valve and higher than the lowest circumferential surface of the other passage (76) of the lower diaphragm valve.